(CNN) â One of the top witnesses to testify against Joaquin « El Chapo » Guzman was sentenced Thursday to 15 years by a federal judge in Chicago, but may get out in five years because of time served.

Vicente Zambada Niebla — who has admitted to passing along orders for murders and kidnappings — is the son of Ismael « El Mayo » Zambada, the alleged current leader of the Sinaloa Cartel.
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